Release NotesThe issue has been fixed since Plesk 9.5.3 for Windows.
SymptomsPlesk Management Service crushes and mail queues are stopped for processing. In the Windows Event viewer it is possible to find the following errors:
Event Type: Error
Event Source: MEMTA.EXE
Event Category: None
Event ID: 1
Time: 14:58:45 PM
The system cannot find the file specified. (Error code 2) at Unable to connect to pipe \\.\pipe\psamailfilterpipe
at (Con::ClientOverlappedPipe::create line 502)
at Mail Enable mail global filter(CPleskMEMTA::Execute line 141)
Execute file name: D:\Program Files (x86)\Parallels\Plesk\Mail Servers\Mail Enable\Bin\MEMTA.EXE
Resolution1. Stop the Plesk Management Service (it is better to use the Plesk Service Monitor tool for the purpose),
2. It is necessary to replace the %plesk_bin%\plesksrv.exe file with the attachment. See the http://kb.sp.parallels.com/en/1802 article about hot-fix installation procedure,
3. Start the Plesk Management Service.